I have already exchanged my Nikon gear for Olympus for the weight and it is nice and small.
Olympus OM-D E-M1 Mark II and OM-D E-M1 Mark III
1 AF / AE sequential shooting with tracking Max 18 fps (AF / AE tracking).
2 AF / AE sequential shooting with lock Max. 60 fps.
3 Focus Stacking: Choose from 3 to 15 shots, including "crop frame" tones from the final photo.
4 Focus Bracketing: 3 to 999 shots.
5 Pro Capture (google it).
6 Live ND, Five levels: ND2, ND4, ND8, ND16, ND32.
7 Weight (housing only) 504 g.
Why you changed the Nikon to Olympus, if you don’t mind me to ask Ron Westbroek